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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d840d7dd7ec9eb95b9286b25ef580d3c14f3841dedddc2a2af63d6d02f7c1ca' 
  AND token = 'BgqfeWWrYB3a+Yzxfrr/t0uln3+NOFPhezzkQpl6WdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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