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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b2586d70a68366c54ad5d556a0dcdfe522c45666d9ec22fdf5fe769c24f768' 
  AND token = 'Xc4Pg+w+xTOuulPy/Te3mZ7pq+IuyafSOoBLhPbj3d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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