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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1e9e182711ef770ae21c36fc5c47511efb79b706f522f1eb5ae2490fe6ce22' 
  AND token = '3nAOCkszGmvoCn7ItSBcTsHNmCi5UaTICqS+jbsh1r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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