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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ea5ee71e58d79110d933e9a83e89596f78baf71a086d1b53ac4f1ebe810f55' 
  AND token = 'lsjw8SlHE/RJKUC4HYCyGUEkfHsNhfSrcmDZeeXdb6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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