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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707d09b5b46fcb9169bf0ea2c1a2366ef48780b1d5f1b2c61a828a3391deb828' 
  AND token = '/BAvKDOnWv6tEdrV05W7AA2txc+OMb6TN/ZOP+uIX54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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