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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8c2f45f757e99a6f3fe8e2fd196ec6c38e4e4cd3df6b0cd38c776245bf7ab7' 
  AND token = 'ms8Z7HpfHNwuzvTuvKOhZMaU7N/RWHY5xFIs7lU5UbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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