SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63890d8536111c0996f5bb7566a432b8c5cf312245a0b0bcc3555f94385ae72c' 
  AND token = '9Is9HwKMKbKbgf3lGuLFVpBmQqBxR/C4RLLANzX5pXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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