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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207bf8c7bc70a2a189e032d878fe75e0efea2d3da07bfc3d35d074550a18870c' 
  AND token = '/iHu28MWuguCXOS8MqoPb9RTPsBHf1MJkMCBybU0B3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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