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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f47af649c050dc371e74b78377d0b5fbb57b5e0ea3d092c9dde4e92f6e879c4' 
  AND token = 'KovP/0ZXAOJPsvw8g/e8vkE9AGwBGQEygM3g5zDgdcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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