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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e039caf24582f53c0db1091d79656ad8b8e513e28204044ffe65f2b6a3cdabb' 
  AND token = 'gOu8eYtpYVY/UQ5tWJg0S0cQEumDzSUTxwI+T23dWLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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