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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b4d860ac902650e922c8a25800376de530042c74281b99a4bbd2197596a95b' 
  AND token = 'hZasi6yvrznEzsL4H5MZHnovsEWt8wvZ0RF5Qu1bcBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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