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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa00c84b51a9db73799276d8a2315ddd07fa45c3a1ff3709194c6e4442e7ad04' 
  AND token = '3Vt7Dp7ivH9bqX3kKqA5Bf2XGKN3lvN/z5XbohB6DQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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