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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2576c4d8e2f2987e64d3cfbf39ca6d37de5cf5cc3cc4bebd18f18cceeaf818ae' 
  AND token = 'TP5HLGyAWMO+B5vM+fFRRFuwv16jLxV7dlMhxBKYUcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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