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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe516451965183c573c87e9fe4c86eee6e7628947ce25f8fb6b23c3e7e5df6dc' 
  AND token = 'ReibKHFwgdc4jqh81hIdbusT6KY54K4r2qhRUsd8Nv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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