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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '500c7d6c9769810dc233819eed94dfce7809b8e6365340fd6995f9bba66fd78e' 
  AND token = '1IXDpiCVA1RjQ4LFHLpOCyNmRnE5zsUhAZIqURouxRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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