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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af6d408d2a33af323d89855d64fd52009da85316f8ff65c3130e3604d8fcb63' 
  AND token = 'VS6NMy7ILll+p5wOH+w0+xjA1YIEW5NA32fjd6LBK2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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