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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62488bcf158013d8a08e89910c4a63e4be57fa17c9689dc1a07f3bca8d65fa8' 
  AND token = 'WOWj2WblNkumWuWX81WjLhpenN5LGnvgSxlMiBGYabQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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