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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd767113f068779233af4043d16a70ffae70be2d69334a7a5544186bdbd1c17c5' 
  AND token = 'ao3RHsTRnWLyw1WKCWhFgTzzH1o3hULhaohIJ+YDiD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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