SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102c2f319c7d75f037a87123da22b790b98a9c7f6d0657584e85e6637e8af924' 
  AND token = 'w8xrO6PEebrqTLGOJdYBwc/HcVhJY7Nun03xPgM+GB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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