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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556353957e94eff49c8115afb25297b815a213e40f777cdf22d68e23bcfdb2bf' 
  AND token = 'UflkKuf2MQf1RH1+xn7sPg8Kq2Utp5uHq+LX8Kt4ZtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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