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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46aaab5a17be1be823ee2a58274e08dda679ecc54b7d8e878edc30243b3f99fd' 
  AND token = 'Glv7d9+fmysoc0qRScm8fd4Kah1/XEJW6dm9xHiFOnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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