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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57033516cb0e2ef8c26f4a097e0df3af53d7010cc105a28948acafba0c33966c' 
  AND token = 'g2oXpU3L6oUfmes8sCPAQrEdJxBwqiaxYi9KgN0XkPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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