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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcfbecea13933a878751065ed9b78ff59bb1cfe18dc21588f28bbd7da2d829b0' 
  AND token = '3QrI/AqDUxei9qSEkeEXaiZoXEj21dR072cFKlIw/Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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