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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54631f9a6ebdbdced1ddb518db4dfa7cfac5290516fcaca225767d6704735629' 
  AND token = 'oiHd16hB4SN+bMq9EbJYxH6KzeJjGZh9OsX7345SuB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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