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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0880656a591a9719a21f0342968f81343f1166d1c80077da1e2ae6255c39eefa' 
  AND token = 'zQJ7WmeBxlU9OPRNkXDcaMabKv6J7aQaZ1IYKGFkth8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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