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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7c90798a15e48d59153ee27e97a17fd10902717118a1b940e76cc4cddc3858' 
  AND token = '/NFQFvDdBIsVyxIx/eQr1gwgZO/1te/gaec0pKGrPGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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