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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca93e5ea007d51796735c36843e0a84754eb574fcc91416e4b96fe7cea1366d' 
  AND token = 'uJqUgnJivdXzvH1aeEZyeA/xheNJC5Yw9F8u9PvFeJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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