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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0e58a5c564b781c0c94092b5d56632c5c65ea562110ade505542ff45788db2' 
  AND token = 'Ax9UCJkQV08QYEvljraUMcBhv9SZqIguiJI2RU006vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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