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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b699029539c3767659a71ae7005746e1f8871fc57c09bcefba8e636f7c346d' 
  AND token = 'qi7KTzYkutGuOJo6vymPfQ653vAYPMfetDl7Z9MY0yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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