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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7cb70f0b39599649acd9c131b43549a57742c2f437ad65fcd7fdfbff8be1c4d' 
  AND token = 'IdzuMx0UNDAfCvWK6hZh1V7uu8xpQagBgktyl1lVfP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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