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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce4af9a79950866a0b47d268459b34029f0d466cf50f94cf03470649b35722f' 
  AND token = 'HSG8BNYSdYfAe2t1zL85/XifGR1IZJi8ysDSkJ37LwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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