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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1006df7450185486162d14c1a01df8f1e31b959211ec0f0eb3eedab500937d1' 
  AND token = 'ITLYyCEo9KuX2Zgwo73JvqstpYByfenJtzJu0XG/efw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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