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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb2b5997d3064ab7d8bf90ad5b41805cb76bb8f2e2e5e8475271d140d55a36d' 
  AND token = 'GiWLZGxZPidQ0pOIrixszDv7CsggP7dcURVml9A1H2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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