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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7840f6f8c5644c45a3fc9fbb21e9861694c2e93f44b7d33d7bf3b69e217d0fb' 
  AND token = '5ywzYOB5cvr+3Xi31D6zfDQQWWx/qi3l15Gior2qvWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00164

JSON explain

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