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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db38368460377960426138c5ebd1404317995b5cbab916e489b3f971cd1e7546' 
  AND token = 'pObpNUqrnBOSGBp9g76Hbf4gW543Pi0bDNa/roMUUBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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