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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee6a2ed35006fbfd41725c1d8137674d6df0c2ab55bc5ea56fd1dee6eb8c4c0' 
  AND token = 'nxICoPzgnWvUx4P1myXbjJGmHajg+sdPH7TpPiF0NZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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