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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a536d466d8d0074e96d577136ce387f0de4d91c8f1b0e89bf9c7b99663b0c558' 
  AND token = 'Ko62wl3UIZVLY6lA6FFQkMvnPQ8tLRPNOpF5IYIhjlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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