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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f17411158929b41dcc6aeb9a093dd9408160da53c04bdb9cf67fbd8866d2aa0' 
  AND token = '2cTUgdK+MqFFxdQURdsRcb/0vv8INqAFm3BaEv/4m/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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