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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb654a862218b61aa60ff3faa47df69f3f138b8c49ce3a3edffb0ef323bd24f4' 
  AND token = 'LvaAzSs2uqWjEfehQ0C6IfeIkV13wRcDH8k+5sZenSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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