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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '265d0c05682d2ebb48ccdcfc1322ff20f6ad4f697a9ac25607aea4ae601f07e7' 
  AND token = 'MBOL05uaQY9FnGfdXca75WEgg7RFJt+KALCcxuaZEXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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