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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b386321b8f064a18db492fe7573a9a2310c85afe448db86390feef3d4a2d62' 
  AND token = '7ZC+4YQJbobNlMai1eIce+WEscBtZYLqLo7MlRBYot0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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