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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda86bb91f3a2f42c72d2a9f762663f17e890d67337532a71c628cd37505eebf' 
  AND token = 'hvUrIGizZL7N+OmeYladRxgNa54NZHCOosKQv3dGTdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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