SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '449b899e06cba5fcea518bf7c0979d86d464861f344fc39345f3b2f7f6c3848f' 
  AND token = '2FmulhTCrQjm+O22GA1fMYshtj2/GvIeE/C1eARwSKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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