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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86314fd3ee73e59b8c1d74dd239f3ce567e4f78e11db9593820dd4b15f4e23da' 
  AND token = '5LEzcvtqm/UKQq1OURhfttxVEvh+S6apXFqWaEjVUHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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