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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93c47a65eeb4c45272bbb6181f2307845cf4a1117ed3a901322697900d0dba4' 
  AND token = 'ne/KCrh1fQtF9quqoym2t1TW2IqcdOXdEW0vWUcYLm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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