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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '618fea1ea67304ac6d0c0e69ceee52bc2088964ec558ed31cd1015b451e80ae3' 
  AND token = 'qY7ksF8dK5HPTGGc3Rdvk0PpTE4RnE4WsudJcPvUZGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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