SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440a995d2f33685a4785f745fb6b56eae0b172e6742ae7ca64b5ce89c43c1726' 
  AND token = 'cKW1fY0my471/MV5KnwYvkpwZFuXQmyFqZQHCHzllPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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