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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afaa83de5afcb73eb42ec19721e0491bf579801da757977eedd97c91042d729' 
  AND token = 'M1gGT+A+1L1iiS1BROnSvuUoa6l74e6Wgb20sRKRZ00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}