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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc2d559199ab08564218354de3ad0a7024a0a21cd073a626f3d832ef2781dbc' 
  AND token = 'DXWY4LjGLRxh7IUuilh/z8xt45B0Wbc17QYgN5098XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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