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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02135b47e09e909efe011cc9e402a306c3480986a2e703e108ac330f0ae7ca47' 
  AND token = 's9vAbys96DIf3UeziwHU8/GaRAI9Y4SfG68zEkJ1k8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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