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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9130b09db1d39aa4c2a6ffbaf8c56e3c918cebabbe686634f83d7780694bff' 
  AND token = 'y9XLIY02YhAi83iJnZCuB8pWdbsR7/xu6inWyZiCukc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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