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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb84a833c4951e5909a860f7da7f3931c768caa3daca4b45e0b36320b7079577' 
  AND token = 'uJOdavOUmZshXwACOIcReKsVbgYfSNNUh8yFVhWLhgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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