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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e737a46938ed9290fbad0c169947478df0da84c74daf572ea0825785e91a43d9' 
  AND token = '4uTRKP7+WyihtOKx02muciCXeQIbmzVgII7bavsbhRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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