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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c500076243ee2a9bb5605309859a7123691fba45ef78056b680b509fd23a51' 
  AND token = '62x9DL08OiaMjdd+pwsYF6C1OLlVjg1vFDB22iK1h5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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