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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd38f8c5eb805352fd6eb1d88234a634c8366b1d3dcc95b11ed2d6bdb347f9626' 
  AND token = 'Bk9JJ850i76jyGCOWciR31p1FWY+hI0mSa0Oco6lNwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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