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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a453a461308705f9040233360034ccc1bd83a4d302360b752bd2e78e4ac67e73' 
  AND token = 'ydCquWkyHIK1EbiRu9rVPZBHRtjMR3DPreY6i+ps1c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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