SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faca6f71a7eede037b91b4dcc86a42f08b9463cb6673afbd5e8aa906d433f1f2' 
  AND token = 'ZsvEB4lPh3owfGsq4+O2+6ZjDYpOZdk2E7hW0FpWVtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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