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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48bab8c35b6a025e88194fed792f9e67edd09ff1ef3cf5c0dc3dac628bda5b3' 
  AND token = 'L2VJOUxx+ednzYmk0vQ10LRYbynyv9TZbA2cPHGVExc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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