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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a64dd54bc0ac623b01776a3ae3ff7e18ff3d04372402c9fb1ec730e134f6c8' 
  AND token = 'anAb7ruAa5tpprWFg0SzG/RLKrK/61PeBcpOKEDpRAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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