SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7449e239872ef35b9513dd6b6b3cd4fffda887a5f4844b4c6861a7ea22bfd86b' 
  AND token = '28tIGELVkF33MPXB/myV4iEB2BrhcOKGCAmuuZR2TvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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