SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e52512cd66b3d8df7f8d4c6930815937f9ea4ba42875feb2374f3cbca72b05' 
  AND token = 'gpqSwlOWNb/JAgrS1B+kxrW5jzYeWjpXZNX5+SesFjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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