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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393a6796f7aa9f7a15546e63dd608ad3c62130ea32c5eaec27ad678c5b03b480' 
  AND token = 'RriIEjU0cYwUSPXj6m1gfw+bbRKB+7pB/LyypKiiFao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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