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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84009d1a83c4adcc8f97e8505f76ecf041b393e130b55db7edf1c9bed796592f' 
  AND token = 'vpkuA1r51A+C1lEpKRc6m4PVpR22uLb03YlrAH9y9Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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