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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b39370baeb2ec8d9a7878eb043e27e4c955b57df16af31177d913e32ef7137' 
  AND token = 'tuf/TxHPzTurno60tdiWZvPgCX9oYnP1hVGQaojeN8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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