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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a278a0cb7f08da34d92aa310577e79af48872109b2c521d1bbebd031b23b5337' 
  AND token = 'GQ07cx4H2rSCOsGN7yythCSopV67OU+zZvNUJ0Rs58Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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