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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033a097e9f80b76055b92f0ca9a6a890bec39e4dbf91e778e2409fc51b75f93b' 
  AND token = '/L6f4eM7zV6RHl8NujiM+GsbhTWJ1VgHy+VxWTrjjlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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