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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5032eb34a5b1fcc9b205234edfe682e9c0325181a64df98dcbf44bf7fc8fc5' 
  AND token = '5JhipZsFRcqEt6z8u3k1YyzNQIZiY6Va/XazZNQyPNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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