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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3cf9c5ff777274f34762a1e6908edde23ebf897d202751580a4ec271f73797' 
  AND token = '5j++wnLJ8vET9s/XBjp3Z0TPcr36+mzMQWU65SWnfcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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