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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9bd08e65871f02a5e211156a09d7cc1a661a2af492f9963407dc74c1b331639' 
  AND token = 'mLzxte3GLsjbBPC5XfCUlnB2w9BSQUu5Dym6eaORAIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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