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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3da42933dd2e2a0da5da39eb60b315f246082d34fecf89ee66529768f4e8761' 
  AND token = '/WlhnSsqsJIgAhvT339pZx1evhagAtlb3HcSNxs6Hxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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