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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9b8e64322ddb37fe6ee25217f5d8b82e5490da2209824047848a9091b7c5ea' 
  AND token = 'eULL0uDkl7QUA9UE50wfig4WbQnsSV9+vRvTf26pfHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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