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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47e8acb7a30b5440dbc32431a533d833b8d1e116ab21ce2b0151b3d0e4349b4' 
  AND token = '5R+M3gKT+SpzEW+KMY/Lo5pvlh5RU67veK0SCy3txt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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