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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b098498ee720df7ba8e488d33448368a31c3ff2f3e6f6a356667adec1273c9' 
  AND token = 'yAuiyaCywz+syc5k3kwknj7yQkTkFDfmw4CzZERAsZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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