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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcee22d0056f55a772116ee0e2150ba1c2e295544a2a907dc4420a4a7a77fc7f' 
  AND token = 'oWMFgEbzJcOyzONUPa91cFnES23SC0u9hyAglyb9I3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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