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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a3e7ac560ea40ce2fb356a54ce977d5d7f1fa9ac1e63f24892b4cb114ee245' 
  AND token = 'hoJVpvCCSrhH3KBKFOHDZq46Bws47hotk/J6DpbcQp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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