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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef5504313a21995370d563b9ca04d40130c2b0daedf8c044145e343acd1f222' 
  AND token = '5sYlQk5QvG1VrfOBaNsQneSCtdb9coXy08ifnnLK2dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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