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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ca119b0cfe3c135b0371d7f7e0614aab8241ea0eae10615ef9dc864f6d6661' 
  AND token = 'lnXlanHCbbEVM1Zg5qWjLZ16dwE/33aTGWCWgduWkoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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