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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d10b47f3e6cdda6384c467b1d7caf40e5e1590b4919a4f82550d31fe6e2374' 
  AND token = '606TaefKfnE6I5MyoukX1292R8Uy8g9MHZKiKYXEyz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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