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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f813ec72624efe8dc05f53bea48684a5da8e2a6162f9dabffea022ecc3a98339' 
  AND token = '/1/EUZwAGfqwd3APamJ3Fd7jiKRWIHA9xrb5/Zb1HgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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