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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029806f1884455b19bfe7c9d205599e340715693552d3119e865dc01f141248d' 
  AND token = 'hsuUMy8fA5zq1K0/bYcrvfSdQOQG5bfE74Co/aU9ZUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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