SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85edaa021334b38472ba6a14cafa1c2ff0751677828c1dccec29702fb8bee397' 
  AND token = 'm4Y2lJ41AmwvyQRbt9LivAqnNVGCsguwPYsmOgMpqCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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