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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc916cd77dde2622048816fdb00689a400103e673d33006cf3fd65ad63e5c35' 
  AND token = 'eo6AO5rwGc3jK6innMIY7GJn91HMsN+UVBOd28AcSug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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